mirror of
https://github.com/AsahiLinux/u-boot
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950eaf6230
It is difficult to track down fail to boot issues in the mxs SPL. Implement the following to make it easier: - Add debug outputs to allow tracing of SPL progress in order to track where failure to boot occurs. DEUBUG and CONFIG_SPL_SERIAL_SUPPORT must be defined to enable debug output in SPL - Add TODO comments where it is not clear if the code is doing what it is meant to be doing, even tough the board boots properly (these comments refer to existing code, not to any code added by this patch) Signed-off-by: Graeme Russ <gruss@tss-engineering.com>
173 lines
5 KiB
C
173 lines
5 KiB
C
/*
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* Freescale i.MX28 Boot setup
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*
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* Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
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* on behalf of DENX Software Engineering GmbH
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <config.h>
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#include <asm/io.h>
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#include <asm/arch/imx-regs.h>
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#include <asm/arch/sys_proto.h>
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#include <asm/gpio.h>
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#include <linux/compiler.h>
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#include "mxs_init.h"
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DECLARE_GLOBAL_DATA_PTR;
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static gd_t gdata __section(".data");
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#ifdef CONFIG_SPL_SERIAL_SUPPORT
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static bd_t bdata __section(".data");
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#endif
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/*
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* This delay function is intended to be used only in early stage of boot, where
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* clock are not set up yet. The timer used here is reset on every boot and
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* takes a few seconds to roll. The boot doesn't take that long, so to keep the
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* code simple, it doesn't take rolling into consideration.
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*/
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void early_delay(int delay)
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{
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struct mxs_digctl_regs *digctl_regs =
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(struct mxs_digctl_regs *)MXS_DIGCTL_BASE;
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uint32_t st = readl(&digctl_regs->hw_digctl_microseconds);
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st += delay;
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while (st > readl(&digctl_regs->hw_digctl_microseconds))
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;
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}
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#define MUX_CONFIG_BOOTMODE_PAD (MXS_PAD_3V3 | MXS_PAD_4MA | MXS_PAD_NOPULL)
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static const iomux_cfg_t iomux_boot[] = {
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#if defined(CONFIG_MX23)
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MX23_PAD_LCD_D00__GPIO_1_0 | MUX_CONFIG_BOOTMODE_PAD,
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MX23_PAD_LCD_D01__GPIO_1_1 | MUX_CONFIG_BOOTMODE_PAD,
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MX23_PAD_LCD_D02__GPIO_1_2 | MUX_CONFIG_BOOTMODE_PAD,
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MX23_PAD_LCD_D03__GPIO_1_3 | MUX_CONFIG_BOOTMODE_PAD,
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MX23_PAD_LCD_D04__GPIO_1_4 | MUX_CONFIG_BOOTMODE_PAD,
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MX23_PAD_LCD_D05__GPIO_1_5 | MUX_CONFIG_BOOTMODE_PAD,
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#elif defined(CONFIG_MX28)
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MX28_PAD_LCD_D00__GPIO_1_0 | MUX_CONFIG_BOOTMODE_PAD,
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MX28_PAD_LCD_D01__GPIO_1_1 | MUX_CONFIG_BOOTMODE_PAD,
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MX28_PAD_LCD_D02__GPIO_1_2 | MUX_CONFIG_BOOTMODE_PAD,
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MX28_PAD_LCD_D03__GPIO_1_3 | MUX_CONFIG_BOOTMODE_PAD,
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MX28_PAD_LCD_D04__GPIO_1_4 | MUX_CONFIG_BOOTMODE_PAD,
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MX28_PAD_LCD_D05__GPIO_1_5 | MUX_CONFIG_BOOTMODE_PAD,
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#endif
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};
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static uint8_t mxs_get_bootmode_index(void)
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{
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uint8_t bootmode = 0;
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int i;
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uint8_t masked;
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/* Setup IOMUX of bootmode pads to GPIO */
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mxs_iomux_setup_multiple_pads(iomux_boot, ARRAY_SIZE(iomux_boot));
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#if defined(CONFIG_MX23)
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/* Setup bootmode pins as GPIO input */
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gpio_direction_input(MX23_PAD_LCD_D00__GPIO_1_0);
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gpio_direction_input(MX23_PAD_LCD_D01__GPIO_1_1);
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gpio_direction_input(MX23_PAD_LCD_D02__GPIO_1_2);
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gpio_direction_input(MX23_PAD_LCD_D03__GPIO_1_3);
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gpio_direction_input(MX23_PAD_LCD_D05__GPIO_1_5);
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/* Read bootmode pads */
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bootmode |= (gpio_get_value(MX23_PAD_LCD_D00__GPIO_1_0) ? 1 : 0) << 0;
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bootmode |= (gpio_get_value(MX23_PAD_LCD_D01__GPIO_1_1) ? 1 : 0) << 1;
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bootmode |= (gpio_get_value(MX23_PAD_LCD_D02__GPIO_1_2) ? 1 : 0) << 2;
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bootmode |= (gpio_get_value(MX23_PAD_LCD_D03__GPIO_1_3) ? 1 : 0) << 3;
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bootmode |= (gpio_get_value(MX23_PAD_LCD_D05__GPIO_1_5) ? 1 : 0) << 5;
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#elif defined(CONFIG_MX28)
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/* Setup bootmode pins as GPIO input */
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gpio_direction_input(MX28_PAD_LCD_D00__GPIO_1_0);
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gpio_direction_input(MX28_PAD_LCD_D01__GPIO_1_1);
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gpio_direction_input(MX28_PAD_LCD_D02__GPIO_1_2);
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gpio_direction_input(MX28_PAD_LCD_D03__GPIO_1_3);
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gpio_direction_input(MX28_PAD_LCD_D04__GPIO_1_4);
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gpio_direction_input(MX28_PAD_LCD_D05__GPIO_1_5);
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/* Read bootmode pads */
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bootmode |= (gpio_get_value(MX28_PAD_LCD_D00__GPIO_1_0) ? 1 : 0) << 0;
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bootmode |= (gpio_get_value(MX28_PAD_LCD_D01__GPIO_1_1) ? 1 : 0) << 1;
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bootmode |= (gpio_get_value(MX28_PAD_LCD_D02__GPIO_1_2) ? 1 : 0) << 2;
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bootmode |= (gpio_get_value(MX28_PAD_LCD_D03__GPIO_1_3) ? 1 : 0) << 3;
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bootmode |= (gpio_get_value(MX28_PAD_LCD_D04__GPIO_1_4) ? 1 : 0) << 4;
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bootmode |= (gpio_get_value(MX28_PAD_LCD_D05__GPIO_1_5) ? 1 : 0) << 5;
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#endif
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for (i = 0; i < ARRAY_SIZE(mxs_boot_modes); i++) {
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masked = bootmode & mxs_boot_modes[i].boot_mask;
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if (masked == mxs_boot_modes[i].boot_pads)
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break;
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}
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return i;
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}
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static void mxs_spl_fixup_vectors(void)
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{
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/*
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* Copy our vector table to 0x0, since due to HAB, we cannot
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* be loaded to 0x0. We want to have working vectoring though,
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* thus this fixup. Our vectoring table is PIC, so copying is
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* fine.
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*/
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extern uint32_t _start;
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/* cppcheck-suppress nullPointer */
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memcpy(0x0, &_start, 0x60);
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}
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static void mxs_spl_console_init(void)
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{
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#ifdef CONFIG_SPL_SERIAL_SUPPORT
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gd->bd = &bdata;
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gd->baudrate = CONFIG_BAUDRATE;
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serial_init();
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gd->have_console = 1;
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#endif
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}
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void mxs_common_spl_init(const uint32_t arg, const uint32_t *resptr,
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const iomux_cfg_t *iomux_setup,
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const unsigned int iomux_size)
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{
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struct mxs_spl_data *data = (struct mxs_spl_data *)
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((CONFIG_SYS_TEXT_BASE - sizeof(struct mxs_spl_data)) & ~0xf);
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uint8_t bootmode = mxs_get_bootmode_index();
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gd = &gdata;
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mxs_spl_fixup_vectors();
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mxs_iomux_setup_multiple_pads(iomux_setup, iomux_size);
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mxs_spl_console_init();
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debug("SPL: Serial Console Initialised\n");
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mxs_power_init();
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mxs_mem_init();
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data->mem_dram_size = mxs_mem_get_size();
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data->boot_mode_idx = bootmode;
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mxs_power_wait_pswitch();
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}
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/* Support aparatus */
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inline void board_init_f(unsigned long bootflag)
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{
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for (;;)
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;
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}
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inline void board_init_r(gd_t *id, ulong dest_addr)
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{
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for (;;)
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;
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}
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